package com.heima.app.gateway.filter;

import com.heima.app.gateway.util.AppJwtUtil;
import io.jsonwebtoken.Claims;
import io.netty.util.internal.StringUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
@Slf4j
public class AuthorizeFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //获取req，resp
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //当请求路径是登录时就直接放行(也包括注册)
        if(request.getURI().getPath().contains("/login")){
            return chain.filter(exchange);
        }
        String token = request.getHeaders().getFirst("token");
        if(StringUtils.isEmpty(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        try {
            //解析token
            Claims claimsBody = AppJwtUtil.getClaimsBody(token);
            //校验
            int i = AppJwtUtil.verifyToken(claimsBody);
            //-1：有效，0：有效，1：过期，2：过期
            if(i==1 && i==2){
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }
        } catch (Exception e) {
            e.printStackTrace();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
